138971 (2001 CB21)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.3333956066 ± 2.78e-09
Semi-major axis (a)1.0335726681 AU ± 1.43e-10
Inclination (i)7.91834368° ± 6.35e-07
Long. of Asc. Node (Ω)353.64713274° ± 2.04e-06
Arg. of Perihelion (ω)271.93550869° ± 1.82e-06
Mean Anomaly (M)131.04916712° ± 8.25e-07
Mean Motion (n)0.9379954932°/day ± 1.95e-10
Perihelion dist (q)0.68898408 AU ± 2.87e-09
Aphelion dist (Q)1.37816125 AU ± 2.87e-09
Orbital Period1.05077934 yr ± 2.19e-10
Physical Parameters
H (abs. magnitude)18.54
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.368″
Uncertainty0
Orbit TypeApollo
MOID0.023880 AU
Observations Used2563
Radar Obs Used2
Oppositions1
Arc Total2001-2026
First Observation Used2001-02-02
Last Observation Used2026-01-13
Observations (3014)
Date Type RA Dec Mag Band Observatory
2006-11-09 18:58:58 C 23 17 25.40 +21 03 05.7 r 240
2006-11-09 19:03:48 C 23 17 25.81 +21 03 04.9 r 240
2006-11-09 19:08:38 C 23 17 26.20 +21 03 03.8 r 240
2006-11-09 19:59:46 C 23 17 30.39 +21 02 54.3 c 434
2006-11-09 20:02:36 C 23 17 30.56 +21 02 54.1 c 434
2006-11-09 20:04:48 C 23 17 30.76 +21 02 53.5 c 434
2006-11-09 20:07:30 C 23 17 30.99 +21 02 52.4 c 434
2006-11-14 17:33:07 C 23 27 35.46 +20 40 29.6 c A94
2006-11-14 17:40:47 C 23 27 36.04 +20 40 26.9 c A94
2006-11-14 17:53:45 C 23 27 37.03 +20 40 26.0 c A94
2006-11-15 03:08:22 C 23 28 22.76 +20 39 03.3 r 703
2006-11-15 03:17:43 C 23 28 23.48 +20 39 01.8 r 703
2006-11-15 03:27:07 C 23 28 24.16 +20 39 00.0 r 703
2006-11-15 03:36:32 C 23 28 24.88 +20 38 58.5 r 703
2006-11-15 19:15:11 C 23 29 42.61 +20 36 25.9 r 113
2006-11-15 19:18:23 C 23 29 42.82 +20 36 25.3 r 113
2006-11-15 19:21:33 C 23 29 43.11 +20 36 24.9 r 113
2006-11-15 19:24:47 C 23 29 43.36 +20 36 24.6 r 113
2006-11-15 19:28:03 C 23 29 43.59 +20 36 24.0 r 113
2006-11-17 03:08:12 C 23 32 19.58 +20 32 00.0 18.2 c 704
2006-11-17 03:26:16 C 23 32 20.96 +20 31 57.1 18.3 c 704
2006-11-17 03:44:18 C 23 32 22.25 +20 31 53.5 18.5 c 704
2006-11-17 04:02:34 C 23 32 23.71 +20 31 51.7 18.5 c 704
2006-11-17 04:20:36 C 23 32 25.05 +20 31 49.0 18.7 c 704
2006-11-18 17:21:14 C 23 35 26.41 +20 26 57.9 r 113
2006-11-18 17:22:56 C 23 35 26.59 +20 26 58.0 r 113
2006-11-18 17:24:38 C 23 35 26.68 +20 26 57.9 r 113
2006-11-18 17:26:20 C 23 35 26.80 +20 26 57.5 r 113
2006-11-18 17:28:01 C 23 35 26.95 +20 26 57.8 r 113
2006-11-23 02:53:52 C 23 43 53.40 +20 16 50.9 r 703
2006-11-23 03:01:35 C 23 43 53.97 +20 16 50.8 r 703
2006-11-23 03:09:19 C 23 43 54.58 +20 16 49.7 r 703
2006-11-23 03:17:02 C 23 43 55.12 +20 16 49.5 r 703
2006-12-11 19:27:52 C 00 19 30.24 +20 19 13.0 r 143
2006-12-11 19:37:41 C 00 19 31.03 +20 19 14.5 r 143
2006-12-15 03:05:25 C 00 25 55.52 +20 26 02.8 r 703
2006-12-15 03:13:08 C 00 25 56.13 +20 26 04.1 r 703
2006-12-15 03:20:52 C 00 25 56.60 +20 26 03.3 r 703
2006-12-15 03:28:35 C 00 25 57.25 +20 26 04.7 r 703
2007-11-02 01:39:06 C 20 26 08.65 -10 35 26.1 18.5 c 704
2007-11-02 01:56:11 C 20 26 13.10 -10 34 58.5 19.6 c 704
2007-11-02 02:13:17 C 20 26 17.40 -10 34 33.0 19.3 c 704
2007-11-02 02:30:22 C 20 26 21.76 -10 34 06.1 19.1 c 704
2007-11-02 02:47:29 C 20 26 26.19 -10 33 38.4 19.3 c 704
2007-11-07 01:39:39 C 20 55 39.40 -07 34 01.0 18.8 c 704
2007-11-07 01:57:50 C 20 55 43.54 -07 33 35.7 19.3 c 704
2007-11-07 02:16:01 C 20 55 47.65 -07 33 08.5 19.1 c 704
2007-11-07 02:34:12 C 20 55 51.79 -07 32 41.5 19.3 c 704
2007-11-07 02:52:22 C 20 55 56.01 -07 32 15.4 19.3 c 704
2007-11-08 02:02:36 C 21 01 14.59 -06 58 37.5 19.3 c 704
Radar Observations (2)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2006-10-02 20:11:00 -9701.3065 0.5 Hz 2380 -1 -1
2006-10-02 21:29:00 47834014.65 1.5 us 2380 -1 -1
Station codes
-1 Arecibo (305-m, 1963–2020)